DocumentCode
2508921
Title
On Frequency Domain Doppler Diversity Using Basis Expansion Model and EM-Based Algorithms in CDMA Systems
Author
Wang, Tianqi ; Li, Cheng ; Chen, Hsiao-Hwa ; Guizani, Mohsen
Author_Institution
Memorial Univ. of Newfoundland, St. John´´s
fYear
2007
fDate
26-30 Nov. 2007
Firstpage
4429
Lastpage
4433
Abstract
In this paper, we propose an algorithm for frequency domain adaptive Doppler shift estimation in the presence of multiple Doppler subpaths in DS-CDMA systems. By modeling doubly selective channel with a basis expansion model (BEM), the proposed method works based on expectation-maximization (EM) algorithm and can accurately estimate Doppler shifts. A complete Cramer-Rao lower bound (CRLB) analysis of the estimation algorithms is also provided.
Keywords
Doppler shift; code division multiple access; optimisation; spread spectrum communication; Cramer-Rao lower bound; DS-CDMA systems; Doppler diversity; Doppler shifts; adaptive Doppler shift estimation; basis expansion model; expectation maximization; frequency domain; Algorithm design and analysis; Computer science; Councils; Doppler shift; Fading; Frequency domain analysis; Frequency estimation; Multiaccess communication; Multipath channels; RAKE receivers;
fLanguage
English
Publisher
ieee
Conference_Titel
Global Telecommunications Conference, 2007. GLOBECOM '07. IEEE
Conference_Location
Washington, DC
Print_ISBN
978-1-4244-1042-2
Electronic_ISBN
978-1-4244-1043-9
Type
conf
DOI
10.1109/GLOCOM.2007.842
Filename
4411752
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